3.2 kg
I will try to make the answer simple for you. Half life is 1600 years. So After 1600 years you have half the mass left. That is 10 grams. After another 1600 years, you will be left with half the mass of 10 grams. That is five grams. So after total 3200 years you will be left with 5 grams of mass of the Ra-226 left with.
That depends on the scale you're working in. If you are working with kilo grams the change is insignificant, but if you're working with 1,00 grams the change is significant.
The total mass of the products will also be 10.0 grams according to the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.
Grams already is a unit of mass. If you want to convert to kilogram, divide by 1000.
The mass of 60 grams is 60 grams, the mass of 0 grams is 0 grams, and the mass of 2.2 grams is 2.2 grams.
There are 3200 grams in 3.2 kilograms. This conversion is based on the fact that there are 1000 grams in 1 kilogram. Therefore, to convert kilograms to grams, you multiply the number of kilograms by 1000. In this case, 3.2 kilograms x 1000 = 3200 grams.
The estimated mass of 300 ml is about 300 grams. This can change based on the temperature and the density of the sample.
B,A
Following the Law of Conservation of Mass (see link below), there will be 20 grams of products in a reaction of 20 grams of reactions.
To determine the mass of the sand, you'll need to subtract the mass of the container (14.5 grams) from the total mass of the container with sand in it. For example, if the total mass of the container with sand is 50 grams, then the mass of the sand would be 50 grams - 14.5 grams = 35.5 grams.
The mass of the powder is 8 grams. This can be calculated by subtracting the mass of the container (4 grams) from the combined mass of the powder and container (12 grams), leaving the mass of the powder as 8 grams.
Grams are a measure of mass.